Try covering up the names of these while guessing what each is supposed to symbolize. Personally, I found some of these to be rather unintuitive and sometimes arbitrary.
Upon looking at them, a dot intuitively ends a sentence. A dot with a line intuitively ends a sentence with emphasis, and a dot with a meandering line questions.
From that perspective a question mark really does indicate uncertainty and possibly a question.
It's definitely “real” in the sense of being in actual use in the wild with a clear and well-understood meaning.
It'd help as much as a new meme on the internet helps the world.